Jaekyum Kim

Abstract A versatile use of a sulfur self‐doped biochar derived from Camellia japonica (camellia) flowers is demonstrated as a multifunctional catalyst for overall water splitting and a supercapacitor. The native sulfur content in the camellia flower facilitates in situ self‐doping of sulfur, which highly activates the camellia‐driven biochar (SA‐Came) as a multifunctional catalyst with the enhanced electron‐transfer ability and long‐term durability. For water splitting, an SA‐Came‐based electro

In oxygen evolution reaction (OER), the participation of lattice oxygen can break the limitation of adsorption evolution mechanism, but the activation of lattice oxygen remains a critical challenge. Herein, a surface fluorinated highly active 2D/2D FeNi layered double hydroxide/MXene (F-LDH/MX) is demonstrated, boosting OER with the enhanced lattice-oxygen-mediated path. The introduction of fluorine promotes the self-evolution of catalyst in an alkaline environment, even without an external curr

ABSTRACT Hydrogen evolution reaction (HER) in acidic media has been spotlighted for hydrogen production since it is a favourable kinetics with the supplied protons from a counterpart compared to that within alkaline environment. However, there is no choice but to use a platinum‐based catalyst yet. As for a noble metal‐free electrocatalyst, incorporation of earth‐abundant transition metal (TM) atoms into nanocarbon platforms has been extensively adopted. Although a data‐driven methodology facilit

Selective glycerol valorization to lactic acid is a promising approach for upgrading biomass-derived waste into value-added chemicals. Herein, we demonstrate photoelectrochemical lactic acid production via glycerol oxidation using a surface-reconstructed n-type CuWO4 photoanode (R-CuWO4). The R-CuWO4 exhibits a solution selectivity of 95.9%, a yield rate of 159.8 mmol m–2 h–1, and a Faraday efficiency of 59.5%. The reconstructed surface overlayer improves catalytic kinetics, reducing the overpot

BiVO4 has garnered considerable interest as a viable photoanode material for photoelectrochemical (PEC) water oxidation owing to its favorable bandgap and suitable band edge position. However, the PEC oxygen evolution property of pristine BiVO4 seriously suffers from its poor surface kinetics and rapid charge recombination. In this study, we demonstrate a combination of element doping and a heterostructure construction strategy, where a Co-doped Fe3O4 (Co:Fe3O4) layer is decorated on the surface

Back cover image: The rational design of transition metal incorporated electrocatalyst for hydrogen evolution reaction is an effective way to produce economical hydrogen. However, the practical application of data-driven methodology is limited due to the complexity of electrochemical systems. In article number cey2.70006, Kim and Sim et al. present the machine learning based facile strategy to optimize the catalyst and experimental conditions. The trained model accurately predicts experimental v

Front cover image: Discovering the creative multifunctional potential of a single material is an essential criterion for formulating highly efficient energy storage and conversion systems. In article number 10.1002/cey2.207, Uk Sim and co-workers report the development of sulfur self-doped biochar (SA-Came) derived from the Camellia Japonica flowers as a multifunctional electrode for overall water splitting and supercapacitor application.